do you golden eared mastering types have any thoughts on the best software for speeding up audio a few bpm. I've been trying with PT elastic audio but am thinking the mastering world may know of some esoteric magic software I'm not aware of? Many thanks for any ideas you may have..

Ableton did it first, but I'm pretty sure Pro Tools and Logic copied the same algorithms. I'm not too familiar with time stretching in Pro Tools or Logic although I have done it. In ableton they give you more choices on what youre time stretching so when the software stretches it, it knows what it's trying to conserve (i.e. gives you the option to stretch by beat, pitch, and a few other options)

Be aware you are posting on a Pro Tools board... and I can guarantee you that most of them are going to swear by PT just because they don't want to leave their comfort zone.

do you golden eared mastering types have any thoughts on the best software for speeding up audio a few bpm. I've been trying with PT elastic audio but am thinking the mastering world may know of some esoteric magic software I'm not aware of? Many thanks for any ideas you may have..

The best with regards to sund quality is to varipitch the audio, via sample rate conversion, for example. Provided you can live with a ptich change, that is.

If you don't want pitch to change, the best I've heard so far is the time stretching algorithm in Wavelab 7.

Haven't tried the new Wavelab one or the Serato one, but I think that Izotope Radius is pretty good on small doses.
Have used it to slow down a portion of a song at the clients request, and all were really happy with the results.

thanks for the replies! - I've just demoed the x-form audiosuite plug which seems to sound a lot better than using x-form in elastic audio...mmm.- odd. Apparently x-from IS izotope radius under license. Going to try and demo pitch and time and see how that fares. I was hoping someone like CEDAR or TC did something super high-end i was unaware of. Unfortunately vari-speeding is not an option - makes the singer sound too high pitched as it is already right at the top of his range.

If I had to choose just one timestretch algorithm, it'd be X-form. Ideally though it's paired with something different such as Pitch and Time. X-form is generally more transparent, but when you can't escape noticeable artefacts, the slight blurring of Pitch and Time can be much more forgiving.

Like so much else, one size doesn't fit all and time stretching / shrinking stereo masters is such a rotten thing to do to audio that I like to audition at least a couple of different algorithms when doing so. Some waveforms just seems to rub certain algorithms up the wrong way. Believe it or not, I even had a situation where the original Digidesign Timestretch plug-in beat everything else I have hands down.

I did a shootout about a year ago and was surprised to find that Waves SoundShifter won by quite a margin provided that I up-sampled from 48k to 96k for the processing. I almost hadn't included it because it's so old.

I did a shootout about a year ago and was surprised to find that Waves SoundShifter won by quite a margin provided that I up-sampled from 48k to 96k for the processing. I almost hadn't included it because it's so old.

wow - will have to check that out. Thanks for the tip Bob! I have that and didn't even think to try it...

I did a shootout about a year ago and was surprised to find that Waves SoundShifter won by quite a margin provided that I up-sampled from 48k to 96k for the processing. I almost hadn't included it because it's so old.

I used Speed from Soundtoys very succesfully a few times, even on a commercial project for Sony, where I had to turn a 105 bpm song's parts to 90 & 125 bpm for downtempo and uptempo remixes. Tried Radius algos, but the results were quite awful compared to Soundtoys stretch.

Ableton did it first, but I'm pretty sure Pro Tools and Logic copied the same algorithms.

They are all quite different! Ableton is good for realtime stretching of solo instruments and voices, while PT is also capable of handling complex mixes. PT has several algorithm options, including X-Form based on iZotope Radius.

Quote:

Originally Posted by 24-96 Mastering

If you don't want pitch to change, the best I've heard so far is the time stretching algorithm in Wavelab 7.

Quote:

Originally Posted by Greg Reierson

WL6 is great as well.

Wavelab 6, 7 are based on Prosoniq DIRAC. My personal (maybe biased) opinion is that it's not as good as the latest Radius, at least not in Wavelab, - it makes all transients "chirpy". I've seen a better implementation of DIRAC in Time Factory 2.

It's pretty outdated. May be good for very soft material, but listen what it does to drums and other transients. Radius should work better in most cases.

Quote:

Originally Posted by Mr XY

I've just demoed the x-form audiosuite plug which seems to sound a lot better than using x-form in elastic audio...mmm.- odd. Apparently x-from IS izotope radius under license.

They may be based on different versions of Radius. Elastic Audio in latest versions on PT should have the latest Radius in it.

Quote:

Originally Posted by Bob Olhsson

I did a shootout about a year ago and was surprised to find that Waves SoundShifter won by quite a margin provided that I up-sampled from 48k to 96k for the processing.

Quote:

Originally Posted by kosmasepsilon

I used Speed from Soundtoys very succesfully a few times, even on a commercial project for Sony, where I had to turn a 105 bpm song's parts to 90 & 125 bpm for downtempo and uptempo remixes. Tried Radius algos, but the results were quite awful compared to Soundtoys stretch.

Wavelab 6, 7 are based on Prosoniq DIRAC. My personal (maybe biased) opinion is that it's not as good as the latest Radius, at least not in Wavelab, - it makes all transients "chirpy". I've seen a better implementation of DIRAC in Time Factory 2.

I'd be interested to try it; is there a stand alone version of Radius or a Radius based algorithm?

If you use it for scaling solo instruments/voices, use Solo mode, otherwise use Mix mode. The Pitch Coherence parameter tunes the algorithm for more solo or more complex material (similarly to DIRAC's Time and frequency localization parameter).

Serato Pitch n Time and waves soundshifter are the best I've heard. I keep my tc/e tool assigned to one of them. Haven't found anything else that sounds better for what I do. X-form sounds ok but is unbelievably slow.